Diff Sugar

Diff.css

/*
	@theme Diff Placeholder
	@placeholder diff
*/

@base {
	color: #333;
	background-color: #fff;
}

diff punctuation.definition.inserted.diff {
	background-color: green;
	
}

diff punctuation.definition.deleted.diff {
	background-color: red;
}

diff punctuation.definition.changed.diff {
	background-color: orange;
}

DiffSyntax.xml

<?xml version="1.0" encoding="UTF-8"?>

<syntax name="sourcecode.diff">

    <zones>
        <include collection="meta"/>
        <include collection="markup"/>
    </zones>

    <library>
    
        <collection name="meta">
        
            <zone name="meta.separator.diff">
                <expression>^((\*{15})|(={67})|(-{3}))$\n?</expression>
                <capture number="1" name="punctuation.definition.separator.diff" />
            </zone>

            <zone name="meta.diff.range.normal">
                <expression>^\d+(,\d+)*(a|d|c)\d+(,\d+)*$\n?</expression>
            </zone>
            
            <zone name="meta.diff.range.unified">
                <expression>^(@@)\s*(.+?)\s*(@@)($\n?)?</expression>
                <capture number="1" name="punctuation.definition.range.diff" />
                <capture number="2" name="meta.toc-list.line-number.diff" />
                <capture number="3" name="punctuation.definition.range.diff" />
            </zone>
            
            <zone name="meta.diff.range.context">
                <expression>^(((\-{3}) .+ (\-{4}))|((\*{3}) .+ (\*{4})))$\n?</expression>
                <capture number="3" name="punctuation.definition.range.diff" />
                <capture number="4" name="punctuation.definition.range.diff" />
                <capture number="6" name="punctuation.definition.range.diff" />
                <capture number="7" name="punctuation.definition.range.diff" />
            </zone>
            
            <zone name="meta.diff.header.from-file">
                <expression>(^(((-{3}) .+)|((\*{3}) .+))$\n?|^(={4}) .+(?= - ))</expression>
                <capture number="4" name="punctuation.definition.from-file.diff" />
                <capture number="6" name="punctuation.definition.from-file.diff" />
                <capture number="7" name="punctuation.definition.from-file.diff" />
            </zone>
            
            <zone name="meta.diff.header.to-file">
                <expression>(^(\+{3}) .+$\n?| (-) .* (={4})$\n?)</expression>
                <capture number="2" name="punctuation.definition.to-file.diff" />
                <capture number="3" name="punctuation.definition.to-file.diff" />
                <capture number="4" name="punctuation.definition.to-file.diff" />
            </zone>
            
            <zone name="meta.diff.index">
                <expression>^Index(:) (.+)$\n?</expression>
                <capture number="1" name="punctuation.separator.key-value.diff" />
                <capture number="2" name="meta.toc-list.file-name.diff" />
            </zone>
            
        </collection>

        <collection name="markup">
            
            <zone name="markup.inserted.diff">
                <expression>^(((&gt;)( .*)?)|((\+).*))$\n?</expression>
                <capture number="3" name="punctuation.definition.inserted.diff" />
                <capture number="6" name="punctuation.definition.inserted.diff" />
            </zone>
            
            <zone name="markup.changed.diff">
                <expression>^(!).*$\n?</expression>
                <capture number="1" name="punctuation.definition.changed.diff" />
            </zone>
            
            <zone name="markup.deleted.diff">
                <expression>^(((&lt;)( .*)?)|((-).*))$\n?</expression>
                <capture number="3" name="punctuation.definition.deleted.diff" />
                <capture number="6" name="punctuation.definition.deleted.diff" />
            </zone>

        </collection>

    </library>
    
</syntax>